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The
Only Certified Accurate Surface Temperature Instruments in
the World
Specifications
NOTE
- ACCURACY SPECS HAVE CHANGED - Click
here for up to date ERROR CALCULATIONS
Download
D-Series brochure (PDF format)
D501
and D501-RS
Compare
the Exergen Microscanner D-series thermometer with conventional
alternatives:
Common
Surface
Temperature
Measurement Factors |
Microscanner
D-series IR
Thermometers |
Conventional
IR "Point and Shoot" guns and probes,
including laser
aimed units |
Conventional
contact probes, thermocouples,
RTD's,
thermistors |
| 1.
Pre-set Emissivity errors? |
no
effect |
very
sensitive |
no
effect |
| 2.
Emissivity shift errors? |
no
effect |
very
sensitive |
no
effect |
| 3.
User adjustment errors? |
no
effect |
very
sensitive |
no
effect |
| 4.
Background reflection errors? |
no
effect |
very
sensitive |
no
effect |
| 5.
Contact errors? |
no
effect |
no
effect |
very
sensitive |
| 6.
Friction heating errors? |
no
effect |
no
effect |
very
sensitive |
| 7.
Heat sinking errors? |
no
effect |
no
effect |
very
sensitive |
| 8.
Time based errors? |
no
effect |
no
effect |
very
sensitive |
The
D-Series is an entirely different type of instrument than
conventional temperature measuring devices. Designed specifically
for the highest possible accuracy, it is the only infrared
instrument which can be certified as to NIST-tracable accuracy
on real surfaces of unknown emissivity, while completely free
of contact errors and heat sinking errors of contact devices.
1.
Pre-set Emissivity errors
The true emissivity of a surface is known only
approximately. Conventional IR devices without Exergen's Automatic
Emissivity Compensation System can only display an approximate
temperature over their entire temperature range. The "accuracy"
specifications given by most manufacturers are only for a
"black body" calibration and do not hold outside
laboratory conditions. Black body calibrations do not include
emissivity shifts, ambient change effects on the target, and
other phenomena that introduce significant errors.
2.
Emissivity shift errors
Even if an IR "gun" is set to the correct emissivity
to read a surface accurately at a particular temperature,
it does not mean that the IR "gun" will read the
same target correctly at other temperatures. Emissivity of
virtually all surfaces changes with temperature. A common
assumption for conventional IR thermometry is that emissivity
is constant with changes in target surface temperature. Real
materials do not have this characteristic.
3.
User Adjustment Errors
A setting
of emissivity = 0.9 on an IR "gun" from one manufacturer
will not necessarily match that of another IR "gun"
manufacturer. There are no standards set in the industry on
the precise measurement and meaning of "emissivity".
Also,
Quality Assurance programs should not rely upon any instrument
that allows users to alter the instrument settings and to
let it display whatever the user wishes.
4.
Background Reflection Errors
Even if emissivity is constant (see #2), there are still errors
induced by changing ambient temperatures. For example, with
emissivity = 0.9, ambient reflections account for 10% of the
signal that the IR "gun" will see. If ambient changes,
the IR "gun" will display a different target temperature,
even if the target remains at the same temperature.
5.
Contact Errors
Thermocouples, RTDs. thermistors, and other contact devices
only measure their own temperature. They do not measure
surface temperature. Published "Accuracy" specifications
are for the probes only, not the surfaces they must measure.
Users must guarantee that the probes are brought the same
temperature as the surface. Can you guarantee that your probes
are brought to the same temperature as the targets to be measured?
6.
Friction heating errors
For moving surfaces, a contact probe is prone to frictional
heating. The size of the error is dependent on the roughness
of the surface, the speed, the coating on the probe, and so
on. It is impossible to control all the variables.
7.
Heat sinking errors
For most non-metals, heat sinking errors can be quite large.
The heat transfer rate of the metal leads required on "contact
probes" conducts heat faster than the target material
can replace, resulting in unknown and fairly large errors.
In general, the less dense the target material, the larger
the heat sinking error with a contact probe.
8.
Time based errors
Contact temperature probes are slow. The temperature of a
target can change more quickly than most probes, resulting
in errors in real time measurement.
| For
the best racing performance, your engine must be tuned
properly. To tune your engine properly, you need to measure
true engine temperature. We are proud to say, the DX501
and D501’s are the only standards in the industry
to make that measurement.
ORDER
ONLINE at: A MAIN HOBBIES
|
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BATTERIES
FOR OLD VERSION MICROSCANNERS
P-100,
6V flat pack batteries for the old style scanners are
available for $7 at: www.photobattery.com
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CALIBRATION/REPAIR
SERVICES:
The D is factory calibrated under high quality standards. Because
there are no mechanical adjustments, the instrument is able
to maintain its calibration through vibration and normal use.
No field calibration is necessary. Calibration certificates
for ISO requirements are available thorough our calibration
service, which provides traceable before and after data with
the model and serial # of your unit, and the date of calibration.
We also provide repair services, if the unit is older than
2 years it is not covered under warranty and the flat fee
for repairs and/or calibration is $155 (USD). You must contact
Industrial Sales (617.923.9900, ext 6238 or industrial@exergen.com)
for a RMA (Return Material Authorization) # before you send
it back. Ship to:
Exergen
Corporation
ATTN:
RMA # _______
400
Pleasant Street
Watertown,
MA 02472 USA
To check
the calibration of your unit, follow this Technote: #75
Checking Calibration of IRt/c or D-Series with Boiling Water
Other
related Technotes are:
#33
Why the D-Series is Recommended for IRt/c Temperature Control
Calibration
#1
Quick Installation Guide: Pre-Calibrated Models
#32
Where is the Emissivity Adjustment?
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